[PATCH] D67462: [ARM] earlyclobber cross beat MVE instructions

Wed Sep 11 12:52:38 PDT 2019

dmgreen created this revision.
dmgreen added reviewers: t.p.northover, ostannard, simon_tatham, SjoerdMeijer, samparker.
Herald added subscribers: hiraditya, kristof.beyls.
Herald added a project: LLVM.

rL367544 <https://reviews.llvm.org/rL367544> added @earlyclobbers for the MVE VREV64 instruction. This adds it for a number of other 32bit instructions that are similarly unpredictable if the destination equals the source (due to the cross beat nature of the instructions).
This includes:

  VCADD.f32
  VCADD.i32
  VCMUL.f32
  VHCADD.s32
  VMULLT/B.s/u32
  VQDMLADH{X}.s32
  VQRDMLADH{X}.s32
  VQDMLSDH{X}.s32
  VQRDMLSDH{X}.s32
  VQDMULLT/B.s32 with Qm and Rm

No tests here as I believe these would require intrinsics (or very interesting codegen) to manifest. The tests will follow naturally as the intrinsics are added.

https://reviews.llvm.org/D67462

Files:
  llvm/lib/Target/ARM/ARMInstrMVE.td

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